Process for the production of fast dyeings on cellulose fabrics



United States ww 7 c $122223 3 v x f V a I is 07H COttbIl staple rayon fabric accord- PROCESS FOR Trui PRODUCTION OF, 'FAST mg to the Pmceduw DYEINGS N CELLULOSE FABRICS 100 g. of cotton yarn or viscose yarn are dyed in nan. dye liquor of 2 l. which contains 7 to 8 g. of the dyeg ggi i?i 2 gggflfif g gggf g gfn iii 7 stuff, g of Glaubers salt or Duisburg sodium sulphate schaft, Leverkusen, Germany, a' corporation of and'2- g. of sodium carbonate (only in the case of dye- Germany i v ing cotton): Dyeing starts at 40 C., the temperature N0 Dl'flwillg- Filed 1964, 561% 402,927 is raised to 80 85 C. within 20 minutes and the bath Claims Priority, application Germany 1963 is left at this temperature for one hour. The yarn is 405956 10 thereafter thoroughly rinsed, first with warm water at I 4 (CL 8-26) 40 C. and then with cold water. It is then coppered The present invention relates to the production of fast in an aqueous bath which contains 3 g. of copper suldyeings on cellulose fabrics phate (CUSO4.5H2O) and 4g. of 40% acetic acid in It has been found thatfast dyeings on cellulose fa'b- 2 1.; the treatment is carried out at 7080 C. for to rics can be'obtained, when a dyeing with the dyestuif of 15 minutes. In order to improve the resistance of the h f l coppered dyeing towards washing and abrasion, it is sub- NHZ ITEN (|)H H21? ..N N=N N=N N:N N=N NH.

NaOiS SOsNa on native or regenerated cellulose is treated with cop sequently soaped .at 45 C. with 0.5 to 1 g./l. of the per discharging agents. This achieves, inter alia, an imsodium salt of a parafi'in-sulphonic acidor with 2 to 3 provement in the fastness to water and to washing, and 25- g./l. of Marseille soap, then rinsed in the cold and dried. this is unexpected in view of the fact that the cellulose .A cotton dyeing prepared with the use of the dyestuff dyeing With this dyestllfi Direct B18615 19=BeI1Z specified at the start of this example, in the form of its F Black is stated to be P b bemg coppered mixture with other toning or accompanying dyestuffs, for in the Colour Index, 2nd edltion, volume 2,- page 2332 instance by use f a mixture f in conjunction with volume 3, Dyestutf No. 35,255. The dyestutf can be dyed on cellulose fabrics by itself 2 of the 320 dyestufl 1'ammo'4mtmbenzenezCar as well as in the form of a mixture with other toning boxylic fwd?2Phenylamino-Sjhydroxy'naphthalenej7 or accompanying d t fi A number of dyestuffs are sulphonic acid, reduced at the nltro groups, treated with frequently employed at the same time in order to pro- Phosgene and PP Q (ml'lilcentl'atlon duce black colour shades. In mixtures of this type, the 3 g. of the 'dyestuff with the formula specified at the proportion of the content of Dyestulf C.I. Direct Black start of this example, and

19 should be at least 20%. 3 g. of the dyestuif OCHz OH HO N=N N=N.QN=N 4.... H000 OOHS HOaS- can also be coppered with the same result.

I claim:

1. Process for the production of fast dyeings on cellulose fabrics, which comprises treating with a copper discharging agent a dyeing with the dyestufl? of the formula The dyeing is carried outby the usual methods. The same applies to the treatment with copper discharging salts. For this purpose, aqueous solutions of copper sulphate are, for instance, suitable.

IYIHQ II'I2N (I)H H21? NaOaS SO3N&

The'following example is given for the purpose of ilon cellulosic fabric. lustrating the invention. 2. Process according to claim 1, wherein said dyeing Example is prepared in the presence of a toning dyestuff. The d t ff of the fo la 3. Fast dyed cellulose fabrics produced by the proc- N H2 alli C| H lihN Na 0 3S S O BN8 6 ess which comprises treating with a copper discharging agent a dyeing with the dyestulf of the formula NHa HiN on HIN l I l on the cellulosic fabric.

4. Cellulose fabric according to claim 3 wherein said dyeing has been prepared in the presence of a toning dyestufl.

. References Cited by theExaminer Diserens, The Chemical Technology of 1951, Dyeing and Printing, vol. 2, pages 5, 35 and 36, publ. by Reinhold Publishing Corp., New York.

Knecht et al., The Principles and Practice of Textile Printing, 4th ed., 1952, pages 246, 1034 and 1035, published by Charles Griffin and Co., Limited, London.

4 Colour Index, 2nd ed. 1956, vol. 2, page 2332, entry I CLI. Direct Black 19,'Colour Index, 2nd ed., vol. 3, page NORMAN G. TORCHIN, Primary Examiner.

T. J. HERBERT, JR., Assistant Examiner. 

1. PROCESS FOR THE PRODUCTION OF FAST DYEINGS ON CELLULOSE FABRICS, WHICH COMPRISES TREATING WITH A COPPER DISCHARGING AGENT A DYEING WITH THE DYESTUFF OF THE FORMULA
 2. PROCESS ACCORDING TO CLAIM 1, WHEREIN SAID DYEING IS PREPARED IN THE PRESENCE OF A TONING DYESTUFF. 